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| author |  Adam Chlipala <adam@chlipala.net> | 2018-05-20 19:28:17 -0400 |
|---|---|---|
| committer | Adam Chlipala <adam@chlipala.net> | 2018-05-20 19:28:17 -0400 |
| commit | 3e8fc5122fed2baee3a4d27d51575f6dd5174ea8 (patch) | |
| tree | 64a5e2411cc1a2d2d3b31ca62c5ca605daa5dd74 | |
| parent | 077666b77bf21054e1e1f67ba61dfbaf57525378 (diff) | |
Proper error message when the body of a 'val' declaration fails to check against the type annotation
| -rw-r--r-- | src/elaborate.sml | 3 | ||||
| -rw-r--r-- | tests/pairUnify.ur | 6 |
2 files changed, 8 insertions, 1 deletions
diff --git a/src/elaborate.sml b/src/elaborate.sml index 4a04d4bf..51d00bd8 100644 --- a/src/elaborate.sml +++ b/src/elaborate.sml @@ -4046,7 +4046,8 @@ and elabDecl (dAll as (d, loc), (env, denv, gs)) = | L.PAnnot (p', _) => singleVar p' | _ => NONE in - unifyCons env loc et pt; + (unifyCons env loc et pt + handle CUnify (c1, c2, env', err) => expError env (Unify (e', c1, c2, env', err))); (case exhaustive (env, et, [p'], loc) of NONE => () diff --git a/tests/pairUnify.ur b/tests/pairUnify.ur new file mode 100644 index 00000000..1c9f9759 --- /dev/null +++ b/tests/pairUnify.ur @@ -0,0 +1,6 @@ +datatype a = A +datatype b = B + +val x : a * b = (A, B) + +val y : b = x |